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(No Model.)

J. A. SEELY FUSE PLUG.

No. 424,229. Patented Mar. 25, 1890.

all/laid WITNESStS:

' INVENTORI Jefl. SLC

ATTORNEYS.

1 JOHN A. snnLY, or

ru's

YORK? N.

' srncrmcnno v formin part of Letters Pat nt it. masses area March 2 5, i890. Application- 51 a NovemberZ, 1889 Serii1 n. 331,676. (Nompdeh To all whom' it mag concern.-

. Be it known that 1, JOHN A. SEELY, of Ne York, in th-ccounty of" New York and State of New York, have invented a new and usef 111 Improvement in Cut-ut Blocks and Plugs, which improvement is fully set forth in the following specification and accompanying drawings, in whichi Figure 1 is a top view of a cut-out blockand plug without the metal furnishingsyFig.

3, an end View of the same; Fig. 3, a side view of the plug; Fig. 4, a top View of the block equipped with theinetal portions; Fig. 5, a side :5. complete ;-block and? plug 'secured together;

/ 2-) I h p g K constrnct'a cut-ont block and plugfor electric View f the plug with'the metal attachments belonging thereto; Fig. 6, a side view of the plf ig." 7', a view offthe underside of the block and plug, and 'g';8 a longitudinal section 0 tho- .thl'o ugh linejiv of. Fig; 5. The objectof "the'present invention is to circuits." Heretoforefcutrout plugs were constructed withm'etal' faces or .strips, which were connectedby means of a fusible wire, .whiclgtrips came in contact with coinciding strips secured to theblock in such a manner;

that at the moment of inserting the plug in- :1he-blo0kt the-circuit would be formed. In like manner in removing the plug the circuit would-be broken by the withdrawal of the :"-plug. j lnfsuchcases tliere is great liability of making imperfect contacts between the strips, thus forming arcs 'anddestroying the. I

strips. Furthermore, the plug would invari a of suflicienti'iItcnsity-"to fuse the plug-wire;

ably be destroyed whenever-the current was 'and;it is sought to; remedy these defects by making a ent=out block and. plug so arranged that-the plug-cannot burnout, can ire-readily repaired by attachinga new wire thereto, and;

all ofjwhichwill nowbefsetforth indetailr- 1- In .fi eiiaccom n grawings Aj repre sentsfa rectangular. block-L or. ,any ;s uitab1e I -thickness,bfoth ends'offwhichjare thinner than ortion -having cntrallyja-circw V fiaigh'ole B ,Ehis hole lifasin itswalls' pm; site, :disposed gtwoideep gains 0, and; shal which; alsoyin'itsiopration servesas azswitch,

tions oiiine ends of the block and are longitndinally; placed in'the block, as shown. N'Vith'inthis-channel, at each-end, I place the foot F ofithe binding-postG and ascrew I-l, passing up through. the block A, holds the same in position? I is a- 'metal'strip having one of its ends socured to the top of the foot F by means of the screw J, While its inner end isbent down at right angles,'as shown at K. These: strips,

having their dojwnturiied ends within the: hole B, are adapted to receive the plug which completes the circuit. Each of tliebinding-i posts-has a cross-plateL, with a screw at each end, so as to receive the wire M between them.

' This arrangement of binding-posts permits me to use any gage of wire, and 1S i3llfil0f0l' far preferable to the ordinary form of binds The plug N is composed, preferably, of porcelain or porcelain-lined material. It has on two opposite sides flattened faces 0, ter' minating at the lower end-in wedge-shaped faces P and at their upper ends at a hole Q, formedthrongh the head R of the plug. The head of theplug has an annular groove S around it, and on its top is a'projecting thumbpiece T, by means of which theplug. may be turned or. removed from its socket in the block.

i In preparing this plug for the metal attach I mentsI first fit a plug of hard rubber U or other insulating material in'the hole Q I then place netal, strips V on the .fiat faces 0 and secure their upper ends to the plug U by means of screws Vs Thelower ends of these strips terminate near" the lower end of the I plug in.outwardly-turnedlugs or hooks X. ,The'fnsible wireY isplaced in the groove S 9 and has its opposite ends secured to the op-' positelydisposed plates V by means of screws Y", which: screws also enter the insulatingplng U, "as shown.

-It will be observed that the metal strips V ventfth'estrips ram lockingpagainst each have one side ground ofi orinclined, as shown other'when the plug is placed in its socket."

lt'will be seen that the depending strips K have their lower. ends slightly approaching leach other when. the. plug spot in the socket,

the plug is inserted in the socket B, the lugs X of the strips 0 enterthe gains C, and when so placed therein the plug cannot be turned u ntilthe head of the plug comes in contact with the upper surface of the block. At the same time while the plug is in this position'the plug-strips V are not in contact with the blockst-rips K, and in order. to complete the circuit the plug must beturned, as shown in Fig. 7, so thatthe strips V K will rest against each other. In the process of turning the plug the .inclined faces Z Z on the strips V K, respectively, serve to force the spring strips into place, be made. As shown in this latter figure, when the plug is turned to its lugs X rest under the lower ends of the strips K, thereby preventing the plug N from being withdrawn until it is again turned so as to bring the lugs to the gains 0, as before described.

As the plug is made of insulating material and not affected by the electrical current, no other damage can be done than to fuse the wire Y in the case of a surplus discharge of electricity. It is also frequently of great importance to be able to cut out the circuit at the plug, and this construction enables it to be done without removing the plug.

hat I'claim as new is- 1. A porcelain or porcelain-faced plug for cut-outs having therein a hard-rubber plug for holding the metal portions, substantially as herein set forth.

2. A cut-out plug composed of porcelain or so that positive contact will atall times proper position, the

' have hereunto set my porcelain-faced material, in combination with a plug therein of hard rubber, and with spring-lingers secured to said plug and the fusible wire, substantially as herein set forth.

3. A cut-out plug having the fusible wire and spring-terminals provided with inclined faces on one side and lugs on their lower ends, in combination with the block having spring terminals with their coinciding faces inclined for making contact with the plug-terminals when the plug is rotated and holding said plug in its socket, substantially as herein set forth. i

4. A partially-rotatable cut-out plug having hooked spring terminals provided with inclined faces on one side and the fusible wire with the block having spring-terminal'sin the socket, said terminals having coinciding. inclined faces, the hooks or lugs of said plugterminals resting beneath said block-terminals and locking the same when the plug is rotated in position to complete the circuit, substantially as herein set forth.

5.' A cut-out block havin g centrally a socket and depending spring-terminals therein and suitable vertical gains in the walls of the socket, in combination with the plug having the spring-terminals provided with outwardlyprojecting lugs and the fusible wire, substain tially as herein set forth.

In testimony that I claiinthe hand, this 25th day of- November, 1889, in the presence of witnesses.

f JOHN A. .SEELY. Witnesses:

JAMES A. TAYLOR,

J. S. ZERBE.

foregoing I 

